﻿// (c) Copyright Ascensio System SIA 2010-2022
//
// This program is a free software product.
// You can redistribute it and/or modify it under the terms
// of the GNU Affero General Public License (AGPL) version 3 as published by the Free Software
// Foundation. In accordance with Section 7(a) of the GNU AGPL its Section 15 shall be amended
// to the effect that Ascensio System SIA expressly excludes the warranty of non-infringement of
// any third-party rights.
//
// This program is distributed WITHOUT ANY WARRANTY, without even the implied warranty
// of MERCHANTABILITY or FITNESS FOR A PARTICULAR  PURPOSE. For details, see
// the GNU AGPL at: http://www.gnu.org/licenses/agpl-3.0.html
//
// You can contact Ascensio System SIA at Lubanas st. 125a-25, Riga, Latvia, EU, LV-1021.
//
// The  interactive user interfaces in modified source and object code versions of the Program must
// display Appropriate Legal Notices, as required under Section 5 of the GNU AGPL version 3.
//
// Pursuant to Section 7(b) of the License you must retain the original Product logo when
// distributing the program. Pursuant to Section 7(e) we decline to grant you any rights under
// trademark law for use of our trademarks.
//
// All the Product's GUI elements, including illustrations and icon sets, as well as technical writing
// content are licensed under the terms of the Creative Commons Attribution-ShareAlike 4.0
// International. See the License terms at http://creativecommons.org/licenses/by-sa/4.0/legalcode

namespace ASC.Common.Caching;

[Singletone]
public class MemoryCacheNotify<T> : ICacheNotify<T> where T : IMessage<T>, new()
{
    private readonly ConcurrentDictionary<string, List<Action<T>>> _actions;

    public MemoryCacheNotify()
    {
        _actions = new ConcurrentDictionary<string, List<Action<T>>>();
    }

    public void Publish(T obj, CacheNotifyAction notifyAction)
    {
        if (_actions.TryGetValue(GetKey(notifyAction), out var onchange) && onchange != null)
        {
            Parallel.ForEach(onchange, a => a(obj));
        }
    }

    public Task PublishAsync(T obj, CacheNotifyAction action)
    {
        if (_actions.TryGetValue(GetKey(action), out var onchange) && onchange != null)
        {
            Parallel.ForEach(onchange, a => a(obj));
        }

        return Task.CompletedTask;
    }

    public void Subscribe(Action<T> onchange, CacheNotifyAction notifyAction)
    {
        if (onchange != null)
        {
            _actions.GetOrAdd(GetKey(notifyAction), new List<Action<T>>())
                    .Add(onchange);
        }
    }

    public void Unsubscribe(CacheNotifyAction notifyAction)
    {
        _actions.TryRemove(GetKey(notifyAction), out _);
    }

    private string GetKey(CacheNotifyAction notifyAction)
    {
        return $"asc:channel:{notifyAction}:{typeof(T).FullName}".ToLower();
    }
}